A key theme of WNBR is to protest about oil dependency – so we really don’t like to hear you are thinking about coming by car or flying. If you use a train hopefully you won’t add to the world’s pollution levels.
Most trains will take bicycles for free on a Saturday, but you do need to check the specific train company you’d be travelling with because they all have different rules. In some cases you have to book – most likely on long-distance services that do seat bookings. In some cases they have limited places on a first come first served basis.
See thetrainline.com which has some useful guidance.
TfL: London Underground, Overground, TfL Rail and DLR
The rule of thumb for TfL services is that you cannot take normal bikes on the deeper, smaller tube trains, but you can at off-peak times on the “subsurface” lines. Bear in mind that there may be lots of steps to carry your bike up!
There is information and a map on the TfL website:
Fully folding bikes are OK on most forms of public transport.